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  <title>Energia Reference - Tone </title>
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<p class='vspace'></p><h2>tone()</h2>
<h4>Description</h4>
<p>Generates a square wave of the specified frequency (and 50% duty cycle) on a pin.  A duration can be specified, otherwise the wave continues until a call to <a class='wikilink' href='NoTone.html'>noTone</a>().  The pin can be connected to a piezo buzzer or other speaker to play tones.  
</p>
<p class='vspace'></p><p>Only one tone can be generated at a time.  If a tone is already playing on a different pin, the call to tone() will have no effect.  If the tone is playing on the same pin, the call will set its frequency.  
</p>
<p class='vspace'></p><p><strong>NOTE:</strong> if you want to play different pitches on multiple pins, you need to call noTone() on one pin before calling tone() on the next pin.
</p>
<p class='vspace'></p><h4>Syntax</h4>
<p>tone(pin, frequency) <br />tone(pin, frequency, duration)
</p>
<p class='vspace'></p><h4>Parameters</h4>
<p>pin: the pin on which to generate the tone
</p>
<p class='vspace'></p><p>frequency: the frequency of the tone in hertz - <em>unsigned int</em>
</p>
<p class='vspace'></p><p>duration: the duration of the tone in milliseconds (optional) - <em>unsigned long</em>
</p>
<p class='vspace'></p><h4>Returns</h4>
<p>nothing
</p>
<p class='vspace'></p><h4>See also</h4>
<ul><li><a class='wikilink' href='NoTone.html'>noTone</a>()
</li><li><a class='wikilink' href='AnalogWrite.html'>analogWrite</a>()
</li><li><a class='wikilink' href='Tutorial_Tone.html'>Tutorial:Tone</a>
</li><li><a class='wikilink' href='Tutorial_PWM.html'>Tutorial: PWM</a>
</li></ul><p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a>
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<p class='vspace'></p><p><em>Corrections, suggestions, and new documentation should be posted to the <a class='urllink' href='http://forum.43oh.com/forum/28-energia/' rel='nofollow'>Forum</a>.</em>
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<p class='vspace'></p><p>The text of the Energia Reference is licensed under a
<a class='urllink' href='http://creativecommons.org/licenses/by-sa/3.0/' rel='nofollow'>Creative Commons Attribution-ShareAlike 3.0 License</a>.  Energia reference is based on Arduino reference.  Code samples in the reference are released into the public domain.
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